The Perl module LWPx::ParanoidAgent is a subclass of LWP::UserAgent, but paranoid against attackers. It's to be used when you're fetching a remote resource on behalf of a possibly malicious user. This class can do whatever LWP::UserAgent can (callbacks, uploads from files, etc), except proxy support is explicitly removed, because in that case you should do your paranoia at your proxy. Only "http:" and "https:" URL schemes are supported.